post thread related issues pls help

i have some problem with PockerTracker3 and i want to post a thread about it, but i've encountered another problem lol. i can't realy seam to manage to post pictures in the thread couse i need to get some details in jpeg format.

all i see here is a button 'insert picture' but when i click it it gives me to fill up an url adress .... i do n't know how to upload pictures from my computer, can anyone please heelp me, how to post pictures (jpeg) in thread?
...it's really annoing...

you can use http://www.imageshack.us when you'll open this page, you'll see browse button, click it, select your image and then press Upload Now, your picture will be uploaded and there will be a link to it